LTC3890EGN-3#PBF

LINEAR TECHNOLOGY  LTC3890EGN-3#PBF  直流/直流控制器, 2相, 4V至60V, 2路输出, 同步降压, 585kHz, SSOP-28

The is a high-performance dual step-down Switching Regulator DC/DC Controller drives all N-channel synchronous power MOSFET stages. The constant frequency current-mode architecture allows a phase lockable frequency of up to 850kHz. Power loss and supply noise are minimized by operating the two controller output stages out-of-phase. The 50µA no-load quiescent current extends operating life in battery-powered systems. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. A wide 4 to 60V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries. Independent TRACK/SS pins for each controller ramp the output voltages during start-up. current-mode control limits the inductor current during short-circuit conditions. The PLLIN/MODE pin selects among burst mode operation, pulse-skipping mode or continuous conduction mode at light loads.

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RSENSE or DCR current sensing

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Out-of-phase controllers reduce input capacitance and power supply induced noise

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Selectable continuous, pulse-skipping or low ripple burst mode operation at light loads

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Adjustable output voltage soft-start or tracking

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Power good output voltage monitor

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Internal LDO powers gate drive from VIN or EXTVCC